Television Apparatus and Electronic Device

ABSTRACT

According to one embodiment, a television apparatus includes: a substrate, a heat transport mechanism, and a pressing member. The heat transport mechanism includes a heat receiving portion, a heat releasing portion, and a heat transferring portion. The heat receiving portion receives heat from an exothermic component of the substrate. The heat releasing portion releases heat. The heat transferring portion houses a medium for carrying heat from the heat receiving portion to the heat releasing portion. The pressing member includes a plurality of portions-to-be-fixed, a pressing portion, a plurality of arm portions, and an engaging portion. The plurality of portions-to-be-fixed are fixed to the substrate. The pressing portion presses the heat receiving portion or presses a heat releasing block thermally-linked to the heat receiving portion against the exothermic body. The plurality of arm portions are disposed in between the portions-to-be-fixed and the pressing portion. The engaging portion engages with the substrate.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based upon and claims the benefit of priority fromJapanese Patent Application No. 2010-139842, filed Jun. 18, 2010, theentire contents of which are incorporated herein by reference.

FIELD

Embodiments described herein relate generally to a television apparatusand an electronic device.

BACKGROUND

Typically, electronic devices are known in which a pressing member isfixed on a substrate and presses a heat receiving portion of a heat pipeor presses a heat releasing block thermally-linked to the heat receivingportion against an exothermic body.

With regard to such electronic devices, there is a demand for preventingthe pressed state of components achieved by making use of the pressingmember from undergoing variation.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

A general architecture that implements the various features of theinvention will now be described with reference to the drawings. Thedrawings and the associated descriptions are provided to illustrateembodiments of the invention and not to limit the scope of theinvention.

FIG. 1 is an exemplary front view of a first orientation of a televisionapparatus which is an electronic device according to a first embodiment;

FIG. 2 is an exemplary front view of a second orientation of thetelevision apparatus in the first embodiment;

FIG. 3 is an exemplary front perspective view of a portion of asubstrate disposed in the television apparatus in the first embodiment;

FIG. 4 is an exemplary rear perspective view of a portion of a substratedisposed in the television apparatus in the first embodiment;

FIG. 5 is an exemplary perspective view of an open state of a personalcomputer which is an electronic device according to a second embodiment;

FIG. 6 is an exemplary perspective view of a second main body of FIG. 5without a display panel, in the second embodiment;

FIG. 7 is an exemplary front view of the second main body of thepersonal computer without the display panel, in the second embodiment;

FIG. 8 is an exemplary rear perspective view illustrating the open stateof the personal computer in the second embodiment;

FIG. 9 is an exemplary perspective view illustrating a first usagepattern of the personal computer in the second embodiment;

FIG. 10 is an exemplary perspective view illustrating a second usagepattern of the personal computer in the second embodiment;

FIG. 11 is an exemplary perspective view illustrating a third usagepattern of the personal computer in the second embodiment;

FIG. 12A is an exemplary plan view of a third orientation of thepersonal computer in the second embodiment;

FIG. 12B is an exemplary plan view of a fourth orientation of thepersonal computer in the second embodiment; and

FIG. 13 is an exemplary rear perspective view of a substrate assemblycomprised in the second main body of the personal computer in the secondembodiment.

DETAILED DESCRIPTION

In general, according to one embodiment, a television apparatuscomprises a substrate, a heat transport mechanism, and a pressingmember. The substrate is housed in a housing, and has an exothermiccomponent mounted thereon. The heat transport mechanism is at leastpartially housed inside the housing. The heat transport mechanismcomprises a heat receiving portion, a heat releasing portion, and a heattransferring portion. The heat receiving portion is configured toreceive heat from the exothermic component. The heat releasing portionis configured to release heat. The heat transferring portion isconfigured to house a medium for carrying heat from the heat receivingportion to the heat releasing portion. The pressing member comprises aplurality of portions-to-be-fixed, a pressing portion, a plurality ofarm portions, and an engaging portion. The plurality ofportions-to-be-fixed are fixed to the substrate. The pressing portion isconfigured to press the heat receiving portion or press a heat releasingblock thermally-linked to the heat receiving portion against theexothermic body. The plurality of arm portions are disposed in betweenthe portions-to-be-fixed and the pressing portion. The engaging portionis configured to engage with the substrate.

According to another embodiment, a television apparatus comprises asubstrate, a pressing member, and an engaging portion. The substrate ishoused in a housing, and has a component mounted or installed thereon.The pressing member is fixed on the substrate, and configured to pressthe component against the substrate. The engaging portion is formed inthe pressing member, and configured to engage with an edge of thesubstrate.

According to still another embodiment, an electronic device comprises: asubstrate, a heat transport mechanism, and a pressing member. Thesubstrate is housed in a housing, and has an exothermic componentmounted thereon. The heat transport mechanism is at least partiallyhoused inside the housing. The heat transport mechanism comprises a heatreceiving portion, a heat releasing portion, and a heat transferringportion. The heat receiving portion is configured to receive heat fromthe exothermic component. The heat releasing portion is configured torelease heat. The heat transferring portion is configured to house amedium for carrying heat from the heat receiving portion to the heatreleasing portion. The pressing member comprises a plurality ofportions-to-be-fixed, a pressing portion, a plurality of arm portions,and an engaging portion. The plurality of portions-to-be-fixed are fixedto the substrate. The pressing portion is configured to press the heatreceiving portion or press a heat releasing block thermally-linked tothe heat receiving portion against the exothermic body. The plurality ofarm portions are disposed in between the portions-to-be-fixed and thepressing portion. The engaging portion is configured to engage thepressing member with the substrate.

As illustrated in FIGS. 1 and 2, according to a first embodiment, atelevision apparatus 1 that is an electronic device comprises a stand 2and a main body 3 supported by the stand 2. Meanwhile, in FIGS. 1 and 2,“UP” represents the upper side in the operating state.

The stand 2 has a base 2 a and a leg 2 b that extends from the base 2 ato the rear side of the central portion of the main body 3. To thefore-end (not illustrated) of the leg 2 b, the tail end (rear end) (notillustrated) of a housing 3 a of the main body 3 is rotatably supportedvia a hinge mechanism (not illustrated) made of, for example, balljoints or universal joints. The television apparatus 1 has what iscalled a pivot function, with which the television apparatus 1 can beused in a landscape-style first orientation P1 (FIG. 1) in which a side4 b of a display screen 4 a is positioned on the upper side and can beused in a portrait-style second orientation P2 (FIG. 2) in which anotherside 4 c of the display screen 4 a is positioned on the upper side. On afront face 3 b of the housing 3 a is disposed a display element 13 forthe purpose of displaying a symbol or a character representing theorientation (for example, the upper side) that is set at the time ofuse. That enables the user to recognize whether the first orientation P1or the second orientation P2 is set.

The housing 3 a of the main body 3 houses a display panel 4 (such as aliquid crystal display (LCD)) that is a display device (display) havingthe display screen 4 a exposed anteriorly from an opening 3 c formed onthe front face 3 b, and houses a substrate 5 a having electroniccomponents such as a central processing unit (CPU) mounted thereon. Thedisplay panel 4 and the subsrate 5 a are fixed to the housing 3 a withscrews or the like (not illustrated). The substrate 5 a and theelectronic components (not illustrated) such as the CPU 6 mounted on thesubstrate 5 a constitute a substrate assembly 5. Meanwhile, in FIGS. 1and 2, the electronic components other than the CPU 6 are notillustrated.

The display panel 4 is formed in the shape of a thin and flatrectangular parallelepiped along the front-back direction (perpendiculardirection to the plane of paper of FIG. 1). The display panel 4 receivespicture signals from a picture signal processing circuit (notillustrated), which is one of the control circuits (not illustrated)configured with the electronic components mounted on the substrate 5 a.Then, the display panel 4 displays stationary pictures or motionpictures on the display screen 4 a that is positioned in the front.Apart from the picture signal processing circuit, the control circuits(not illustrated) in the television apparatus 1 comprises a tunermodule, a high-definition multimedia interface (HDMI) signal processingmodule, an audio-video (AV) input terminal, a remote control signalreceiving module, a control module, a selector, an on-screen displayinterface, a memory module (such as a read only memory (ROM), a randomaccess memory (RAM), or a hard disk drive (HDD)), and an audio signalprocessing circuit. The substrate 5 a (substrate assembly 5) is housedbehind (on the rear side of) the display panel 4 inside the housing 3 a.Meanwhile, the television apparatus 1 has built-in amplifiers orspeakers (not illustrated) for the purpose of audio output.

As illustrated in FIGS. 1 and 2, the CPU 6 that is an exothermicelectronic component is mounted on the substrate 5 a. On die (notillustrated) of the CPU 6 is mounted a heat releasing block 6 a, and onthe heat releasing block 6 a is mounted a heat receiving portion 7 a ofa heat pipe 7 that functions as a heat transport mechanism. The heatreceiving portion 7 a is pressed against the heat releasing block 6 awith a pressing member 8, which is fixed to the substrate 5 a usingscrews 9 as fastening members. In such a configuration, the heatgenerated by the exothermic CPU 6 is transported to the heat receivingportion 7 a via the heat releasing block 6 a.

The heat pipe 7 functioning as the heat transport mechanism is a pipehaving, for example, an elongated flattened cross-section and is made ofa metallic component (such as copper alloy) having relatively high heatconductivity. One end of that pipe constitutes the heat receivingportion 7 a, while the other end thereof constitutes a heat releasingportion 7 b. The portion in between the heat receiving portion 7 a andthe heat releasing portion 7 b is a heat transferring portion 7 c. Onthe outside of the heat releasing portion 7 b are attached fins (notillustrated) that are made of thin sheets of a metallic component (suchas copper alloy) having relatively high heat conductivity. Moreover,inside the housing 3 a, at a position adjacent to the heat releasingportion 7 b is installed a fan 10 that has a thin flat appearance in thethickness direction of the substrate 5 a and that comprises a rotor (notillustrated) rotating around a rotary shaft positioned along aperpendicular direction to the front and rear faces of the substrate 5a. The rotor of the fan 10 is rotated using an electric motor so that,for example, the air that is taken in from the housing 3 a through airinlets (not illustrated) formed on both sides of the axial direction ofthe rotary shaft (i.e., formed on the front side and on the rear side)is discharged through an exhaust outlet (not illustrated) formedopposite to the heat releasing portion 7 b. That is, the flow of airdischarged by the fan 10 reaches the heat releasing portion 7 b and thefins, as a result of which the heat releasing portion 7 b and the finsare subjected to cooling. Meanwhile, the fan 10 is fit in an L-shapednotch 5 b formed at a corner of the substrate 5 a.

Within the heat pipe 7 is enclosed a heat transport medium such as thealternative for chlorofluorocarbon having relatively high volatility.Inside the heat pipe 7, the heat transport medium at the heat receivingportion 7 a first evaporates into gas due to the heat generated by theCPU 6, then reaches the heat releasing portion 7 b in the gaseous statevia the heat transferring portion 7 c, and then condenses to liquid bygetting cooled at the heat releasing portion 7 b. The heat transportmedium in the liquid state returns from the heat releasing portion 7 bto the heat receiving portion 7 a via the heat transferring portion 7 c,and evaporates into gas at the heat receiving portion 7 a. Thus, theheat transport medium absorbs latent heat at the heat receiving portion7 a and releases that latent heat at the heat releasing portion 7 b. Asa result, the heat gets transported from the heat receiving portion 7 ato the heat releasing portion 7 b. That is, the heat generated by theexothermic CPU 6 is transported to the heat releasing portion 7 b viathe heat receiving portion 7 a and the heat transferring portion 7 c(through the heat transport medium flowing therein) and is thentransferred from the heat releasing portion 7 b into the flow of air,which is then discharged to the outside of the housing 3 a through anexhaust outlet 3 d formed therein.

As can be seen in FIGS. 1 and 2 according to the present embodiment, inthe first orientation P1 (FIG. 1) as well as in the second orientationP2 (FIG. 2), the heat receiving portion 7 a is positioned on the lowerside of the heat releasing portion 7 b. In the heat pipe 7 functioningas the heat transport mechanism, in case the heat receiving portion 7 ais positioned on the upper side of the heat releasing portion 7 bthereby forming what is called a top heat condition, the heat transportmedium in the liquid state does not easily return to the heat receivingportion 7 a from the heat releasing portion 7 b. That causes a declinein the heat transport efficiency, that is, in the heat releasingefficiency. Thus, in the present embodiment, the heat receiving portion7 a is positioned on the lower side of the heat releasing portion 7 b inboth of the first orientation P1 (FIG. 1) and the second orientation P2(FIG. 2) that are defined to be the correct orientations. Hence, itbecomes possible to prevent the heat transport efficiency, that is, theheat releasing efficiency from declining.

Moreover, in the present embodiment, the heat releasing portion 7 b isdisposed at a corner 3 e that lies at the upper end of the housing 3 ain the first orientation P1 (FIG. 1) and in the second orientation P2(FIG.). Since the heat is prone to rise inside the housing 3 a due tothe air current; disposing the heat releasing portion 7 b at the corner3 e, which lies at the upper end of the housing 3 a in both of the firstorientation P1 and in the second orientation P2, makes it possible toprevent heat accumulation from occurring inside the housing 3 a.

The pressing member 8 has a pressing portion 8 a and a plurality offirst arm portions 8 b. The pressing portion 8 a is formed into asubstantially rectangular plate and is mounted above the heat releasingblock 6 a, which is mounted on the CPU 6, and installed above the heatreceiving portion 7 a of the heat pipe 7, which is mounted on the CPU 6.The first arm portions 8 b are formed in a strip-like manner and extendoutward in three different directions (in FIG. 1, in the upper-rightdirection, the lower-left direction, and the lower-right direction).Besides, each first arm portion 8 b also extends upward while extendingoutward from the pressing portion 8 a. At the fore-end of each first armportion 8 b is disposed a bracket 8 c, which is a portion-to-be-fixedthat is fixed to the substrate 5 a. In order to fix the pressing member8 to the substrate 5 a, the screws 9 that are fastening members arepassed through the through holes formed on the brackets 8 c and screwedinto the stand (not illustrated) that represents a portion-to-be-fixed.Each bracket 8 c is either fixed to a stand (not illustrated) protrudingfrom the substrate 5 a or flexes downward to form a droop portion (avertical wall portion, not illustrated) facing the surface of thesubstrate 5 a. Consequently, the fore-end side (outer side) of eachfirst arm portion 8 b lies higher than the base end side (inner side)thereof, which helps in increasing the pressing force exerted by thefirst arm portions 8 b against the pressing portion 8 a and, byextension, helps in increasing the pressing force exerted by thepressing member 8 against the pressing target of the heat releasingblock 6 a or the heat pipe 7.

Besides, in the present embodiment, the pressing member 8 also has asecond arm portion 8 d, which is formed in a strip-like manner and whichextends outward (in FIG. 1, in the upper-left direction). In the presentembodiment, the second arm portion 8 d extends almost parallel to afront face 5 c that is the front side face of the substrate 5 a. Asillustrated in FIG. 3, at the fore-end of the second arm portion 8 d isformed a contact portion 8 e that makes contact with that portion on thefront face 5 c of the substrate 5 a which is positioned on the upperside in the first orientation P1. The contact portion 8 e has twoengaging claws 8 f and 8 g (see FIGS. 3 and 4), which correspond toengaging portions in the present embodiment. Meanwhile, the front face 5c of the substrate 5 a serves as the mounting face for the CPU 6 that isan exothermic component and also serves as the face on that side of thesubstrate 5 a on which the pressing member 8 is mounted.

The engaging claw 8 f has a first wall portion 8 f 1 that, in the firstorientation P1 of the main body 3, protrudes from the top edge of thecontact portion 8 e along an edge (lateral side) 5 d that becomes theupper side of the substrate 5 a in the first orientation P1, and has asecond wall portion 8 f 2 that protrudes from the tip of the first wallportion 8 f 1 along a rear face (surface) 5 e of the substrate 5 a.Thus, the contact portion 8 e, the first wall portion 8 f 1, and thesecond wall portion 8 f 2 present a hook-like appearance, and, in thefirst orientation P1 of the main body 3, hook from above into the edge 5d that is the upper side of the substrate 5 a. Consequently, the firstwall portion 8 f 1 restricts the pressing member 8 from moving downwardwith respect to the substrate 5 a in the first orientation P1 of themain body 3; while the second wall portion 8 f 2 restricts the pressingmember 8 from moving along the normal direction of the front face 5 c ofthe substrate 5 a. In the present embodiment, the first wall portion 8 f1 corresponds to a first engaging portion and the second wall portion 8f 2 corresponds to a second engaging portion.

The engaging claw 8 g is configured as a wall portion that, in thesecond orientation P2 of the main body 3, protrudes from the top edge ofthe contact portion 8 e along an edge (lateral side) 5 f that is theupper side of the substrate 5 a. Thus, in the second orientation P2 ofthe main body 3, the engaging claw 8 g restricts the pressing member 8from moving downward with respect to the substrate 5 a. In the presentembodiment, the engaging claw 8 g also corresponds to a first engagingportion.

In this way, in the present embodiment, the pressing member 8 has thefirst wall portion 8 f 1, the second wall portion 8 f 2, and theengaging claw 8 g that represent the plurality of engaging portionshaving different engaging directions. For that reason, when the pressingmember 8 is used in an electronic device such as the televisionapparatus 1 in which the main body 3 can have different orientations, itbecomes possible to prevent misalignment of the pressing member 8 from apredetermined position or prevent deformation of the pressing member 8that can occur due to the external force, the gravitation force, or theinertia force acting thereon. More particularly, in the presentembodiment, the first wall portion 8 f 1 restricts the pressing member 8from moving downward in the first orientation P1; while the engagingclaw 8 g restricts the pressing member 8 from moving downward in thesecond orientation P2. Moreover, the second wall portion 8 f 2 restrictsthe pressing member 8 from moving away from the front face 5 c of thesubstrate 5 a.

As described above, in the present embodiment, the pressing member 8presses the heat receiving portion 7 a of the heat pipe 7 against theheat releasing block 6 a or the CPU 6. Usually, the heat releasingportion 7 a constitutes one end of the heat pipe 7 and fins (notillustrated) are soldered at the heat releasing portion 7 b on the otherend of the heat pipe 7. Thus, the pressing portion 8 a of the pressingmember 8 supports the heat pipe 7 in a cantilever manner at one end (atthe heat releasing portion 7 a) in the longitudinal direction, and thegravitational force or the inertia force acting on the heat pipe 7 actsas the external force on the pressing portion 8 a. In the presentembodiment, the external force from the heat pipe 7 acts as a rotationalmoment (torque) on the pressing portion 8 a. In the direction along thefront face 5 c of the substrate 5 a (i.e., in the in-plane direction),the gravitation force acting on the fins and the heat pipe 7 in thefirst orientation P1 (FIG. 1) of the main body 3 causes a rotationalmoment (M1) in the counterclockwise direction with reference to FIG. 1.With respect to the counterclockwise rotational moment, the first wallportion 8 f 1 functions as the first engaging portion and restricts themovement of the pressing member 8 caused due to that rotational moment.In the second orientation P2 (FIG. 2) of the main body 3, thegravitation force acting on the fins and the heat pipe 7 causes arotational moment (M2) in the clockwise direction with reference toFIG. 1. With respect to the clockwise rotational moment, the engagingclaw 8 g functions as the first engaging portion and restricts themovement of the pressing member 8 caused due to that rotational moment.Meanwhile, in the direction crossing the front face 5 c of the substrate5 a (i.e., in the out-of-plane direction), the gravitation force actingon the fins and the heat pipe 7 in the first orientation P1 (FIG. 1) andthe second orientation P2 (FIG. 2) of the main body 3 causes arotational moment in the direction in which the upper part of thepressing member 8 tilts forward and away from the front face 5 c of thesubstrate 5 a. With respect to that rotational moment, the second wallportion 8 f 2 functions as the second engaging portion and restricts themovement of the pressing member 8 caused due to that rotational moment.Because of the second wall portion 8 f 2, the contact area between theheat receiving portion 7 a and the heat releasing block 6 a (CPU 6) canbe prevented from decreasing and, by extension, the heat transportefficiency (i.e., the heat releasing efficiency) can be prevented fromdeclining. In this way, the engaging claws 8 f and 8 g restrict thepressing member 8 from rotating.

Moreover, in the present embodiment, each of the first wall portion 8 f1, the second wall portion 8 f 2, and the engaging claw 8 g engages atthe rim portions of the substrate 5 a. That eliminates the need to fromthrough holes in the substrate 5 a. Hence, a simpler structure can beconfigured for the purpose of engagement with the substrate 5 a.

Furthermore, in the present embodiment, as illustrated in FIGS. 3 and 4;the first wall portion 8 f 1, the second wall portion 8 f 2, and theengaging claw 8 g engage at a corner 5 g of the substrate 5 a. For thatreason, it becomes easier to collectively dispose the first wall portion8 f 1, the second wall portion 8 f 2, and the engaging claw 8 g, each ofwhich engages in a different direction. Hence, the pressing member 8having a plurality of engaging portions can be configured in a morecompact manner.

Particularly, in the present embodiment, the first wall portion 8 f 1and the engaging claw 8 g engage at edges 5 d and 5 f, respectively,which are the two rim portions linked to the corner 5 g. Hence, theportion including the first wall portion 8 f 1 and the engaging claw 8 gcan be configured in a more compact manner.

Moreover, in the present embodiment, a through hole 8 h is formed in thecontact portion 8 e, which serves as the base on which the first wallportion 8 f 1, the second wall portion 8 f 2, and the engaging claw 8 gare disposed. Through the through hole 8 h is passed a screw (notillustrated) that is used to fit the pressing member 8 on the substrate5 a or used to fix the substrate 5 a to the housing 3 a of the main body3. Thus, the contact portion 8 e corresponds to a portion-to-be-fixedthat is fixed to the substrate 5 a. In such a configuration, theengaging portions, namely, the first wall portion 8 f 1, the second wallportion 8 f 2, and the engaging claw 8 g can be configured in a morecompact manner as compared to the case when those engaging portions aredisposed at some other position on the pressing member 8. Moreover,since the rim portions or the corner 5 g of the substrate 5 a do notusually have any circuits designed thereon, it is easier to use thoseportions for fixing the pressing member 8 to the substrate 5 a. Hence,as described in the present embodiment, by positioning the contactportion 8 e on the rim portions or on the corner 5 g of the substrate 5a and by using the contact portion 8 e as the portion-to-be-fixed forthe purpose of fixing the pressing member 8 to the substrate 5 a, itbecomes possible to achieve engagement of the pressing member 8 with thesubstrate 5 a as well as to prevent the implementation efficiency ofcircuits from declining with a relatively simple configuration.

According to a second embodiment, a notebook-sized personal computer 20functioning as an electronic device comprises a rectangular and flatfirst main body 21 and a rectangular and flat second main body 22 asillustrated in FIG. 5. The first main body 21 and the second main body22 are connected in a relatively rotatable manner via a joint 23.

In the first main body 21, a display panel 25 such as an LCD, which is adisplay device having a touch panel 24 on the front face (i.e., on adisplay screen 25 a), and a push button mechanism 26 are arranged in anexposed manner on a front face 21 b that is the external face of ahousing 21 a. Similarly, in the second main body 22, a display panel 28such as an LCD, which is a display device having a touch panel 27 on thefront face (i.e., on a display screen 28 a), and a push button mechanism29 are arranged in an exposed manner on a front face 22 b that is theexternal face of a housing 22 a.

In the open state illustrated in FIG. 5, the display panel 25 and coverbodies 26 a of the push button mechanism 26 as well as the display panel28 and a cover body 29 a of the push button mechanism 29 lie in anexposed condition. In such a state, the user is able to performoperations. In contrast, in a folded state (not illustrated), the frontfaces 21 b and 22 b face each other from up close in such a way that thedisplay panel 25 and the cover bodies 26 a of the push button mechanism26 are hidden by the housing 21 a; while the display panel 28 and thecover body 29 a of the push button mechanism 29 are hidden by thehousing 22 a. In the present embodiment, the touch panels 24 and 27, thepush button mechanisms 26 and 29, and a microphone (not illustrated)function as input operation modules; while the display panels 25 and 28and speakers (not illustrated) function as output operation modules.Meanwhile, in a personal computer having a keyboard, or click buttons,or a pointing device (not illustrated); the keyboard or the clickbuttons also function as input operation modules.

The joint 23 connects the first main body 21 with the second main body22, and is configured separately from the first main body 21 and thesecond main body 22. The joint 23 connects an end portion 21 c at thebase end of the first main body 21 with an end portion 22 c at the baseend of the second main body 22. At the central part in the longitudinaldirection of an end edge 21 d of the end portion 21 c and at the centralpart in the longitudinal direction of an end edge 22 d of the endportion 22 c, respectively; rectangular notches 21 e and 22 e are formedexcept over the respective ends. Each of the rectangular notches 21 eand 22 e has a long opening along the longitudinal direction and hasonly a shallow depth. Half of the joint 23 is inserted in the notch 21 eand the remaining half thereof is inserted in the notch 22 e. A length Lof the joint 23 is set to be slightly shorter than the width of thenotches 21 e and 22 e. Moreover, a width W of the joint 23 is set to besubstantially equal to the thickness when the first main body 21 and thesecond main body 22 are closed together in the folded state.

The first main body 21 and the joint 23 are connected in a relativelyrotatable manner around a rotation axis Ax1 via a first hinge mechanism30A. Similarly, the second main body 22 and the joint 23 are connectedin a relatively rotatable manner around a rotation axis Ax2 via a secondhinge mechanism 30B. The rotary shafts Ax1 and Ax2 lie parallel to eachother. In the present embodiment, the first hinge mechanism 30A and thesecond hinge mechanism 30B are coupled together so that the relativerotation angle around the rotation axis Ax1 of the first main body 21with respect to the joint 23 is identical to the relative rotation anglearound the rotation axis Ax2 of the second main body 22 with respect tothe joint 23. However, the two relative rotation directions with respectto the joint 23 are opposite to each other. Thus, when the user operatesthe joint 23 for the purpose of opening either one of the first mainbody 21 and the second main body 22, the personal computer 20 falls intothe open state. Similarly, when the joint 23 is operated for the purposeof closing either one of the first main body 21 and the second main body22, the personal computer 20 falls into the folded state. Moreover, whenthe user opens the first main body 21 and the second main body 22, thepersonal computer 20 falls into the open state. Similarly, when thefirst main body 21 and the second main body 22 are closed, the personalcomputer 20 falls into the folded state.

In the present embodiment, as illustrated in FIGS. 6 and 7, a substrate31 a (a substrate assembly 31) with at least some of the controlcircuits including electronic components 37 mounted thereon is disposed,for example, inside the housing 22 a of the second main body 22. In thehousing 22 a, the display panel 28 and the substrate 31 a are fixed withscrews or the like (not illustrated). Meanwhile, as illustrated in FIG.8, in the first main body 21, a battery 32 is disposed as a power supplybehind (on the rear side of) the display panel 25. On the rear side ofthe first main body 21, a depressed portion 21 f is formed that isrectangular in appearance when viewed from the back. The depressedportion 21 f gets covered by the battery 32 when the battery 32 isdetachably attached to the housing 21 a of the first main body 21. Thus,in the present embodiment, the substrate 31 a (the substrate assembly31) with the main electronic components such as a CPU 38 mounted thereonis disposed in the second main body 22, while the battery 32 is disposedin the first main body 21. In case the substrate assembly 31 and thebattery 32 are disposed together in either one of the first main body 21and the second main body 22, then following inconveniences are morelikely to occur. For example, the thickness of the main bodies increasesor, if there is a restriction on the thickness, then it becomesnecessary to reduce the size and eventually the capacity of the battery32. In contrast, in the present embodiment, the substrate assembly 31and the battery 32 are separately disposed in the second main body 22and the first main body 21, respectively. That makes it possible toavoid the abovementioned inconveniences. In this regard, however, in afirst usage pattern U1 illustrated in FIG. 9; the first main body 21 islarger in mass than the second main body 22 so that the personalcomputer 20 can be stably placed on a desk or the like. In the presentembodiment, the first main body 21 corresponds to a different main bodythat is connected to the second main body 22, which houses the substrateassembly 31, in a relatively rotatable manner via the hinge mechanisms30A and 30B. Moreover, the display screen 25 a of the display panel 25in the first main body 21 corresponds to a different display screen.

Apart from the first usage pattern illustrated in FIG. 9, the personalcomputer 20 according to the present embodiment can be used in a secondusage pattern U2 illustrated in FIG. 10 as well as in a third usagepattern U3 illustrated in FIG. 11. As illustrated in FIG. 10, the secondusage pattern U2 is such that the first main body 21 and the second mainbody 22 are unfolded relatively widely, and a margin portion 21 g onboth sides in the width direction of the first main body 21 is held withhands H. In this second usage pattern U2, the user holding the firstmain body 21 with the hands H can operate the push button mechanism 26with thumbs T. As illustrated in FIG. 11, the third usage pattern U3 issuch that the first main body 21 and the second main body 22 areunfolded relatively widely, and a margin portion 21 h on one side in thewidth direction of the first main body 21 and a margin portion 22 f onone side in the width direction of the second main body 22 are held withthe hands H. Herein, as far as the view of the user is concerned, thesecond usage pattern U2 is identical to the first usage pattern U1.However, as opposed to placing the personal computer 20 on a desk in thefirst usage pattern U1, the second usage pattern U2 is such that thepersonal computer 20 is held with the hands H while standing or sitting.Regarding the third usage pattern U3, the orientation of the displayscreens 25 a and 28 a of the display panels 25 and 28, respectively, isdifferent by about 90° as compared to the orientation in the first usagepattern U1 and the second usage pattern U2.

Thus, the personal computer 20 according to the present embodiment canbe used in the first orientation P1 (i.e., in the first usage pattern U1and the second usage pattern U2, see FIGS. 9 and 10) in which a side 28b of the display screen 28 a of the display panel 28 is positioned onthe upper side and can be used in the second orientation P2 (i.e., inthe third usage pattern U3, see FIG. 11) in which another side 28 b ofthe display screen 28 a of the display panel 28 as well as a side 25 bof the display screen 25 a of the display panel 25 are positioned on theupper side. The side 28 b of the display screen 28 a is distantlypositioned from a boundary Bd between the first main body 21 and thesecond main body 22; while another side 28 c of the display screen 28 aand the side 25 b of the display screen 25 a are positioned to face eachother across the boundary Bd. In the present embodiment, the firstorientation P1 for the two display screen 28 a also represents a thirdorientation P3 for the display screens 28 a and 25 a; while the secondorientation P2 for the display screen 28 a also represents a fourthorientation P4 for the two display screens 28 a and 25 a.

Herein, each of the display panels 25 and 28 is formed in the shape of aflat rectangular parallelepiped, and receives display signals fromcontrol circuits (not illustrated) configured with the electroniccomponents mounted on the substrate 31 a. Moreover, each of the displaypanels 25 and 28 displays stationary pictures or motion pictures. In thepresent embodiment, the light that represents the pictures displayed onthe display screens 25 a and 28 a of the display panels 25 and 28,respectively, is output anteriorly via the display panels 25 and 28,respectively, which are colorless and transparent in nature. The controlcircuits in the personal computer 20 include a control module, a memorymodule (such as a ROM, a RAM, or an HDD), an interface circuit, andvarious controllers. Meanwhile, the personal computer 20 also hasbuilt-in speakers (not illustrated) for the purpose of audio output.

As illustrated in FIGS. 6 and 7, the CPU 38 that is an exothermicelectronic component is mounted on the substrate 31 a. On the die (notillustrated) of the CPU 38 is mounted a heat releasing block 38 a, andon the heat releasing block 38 a is mounted a heat receiving portion 41a of a heat pipe 41 that functions as a heat transport mechanism. Theheat receiving portion 41 a is pressed against the heat releasing block38 a with a pressing member 42, which is fixed to the substrate 31 ausing a screw 43 that is a fastening member. In such a configuration,the heat generated by the exothermic CPU 38 is transported to the heatreceiving portion 41 a via the heat releasing block 38 a.

The heat pipe 41 functioning as the heat transport mechanism is a pipehaving, for example, an elongated flattened cross-section and is made ofa metallic component (such as copper alloy) having relatively high heatconductivity. One end of that pipe constitutes the heat receivingportion 41 a, while the other end thereof constitutes a heat releasingportion 41 b. The portion in between the heat receiving portion 41 a andthe heat releasing portion 41 b is a heat transferring portion 41 c. Onthe outside of the heat releasing portion 41 b are attached a pluralityof fins 41 d that are made of thin sheets of a metallic component (suchas copper alloy) having relatively high heat conductivity. Moreover,inside the housing 22 a, at a position adjacent to the heat releasingportion 41 b is installed a fan 40 that has a thin flat appearance inthe thickness direction of the substrate 31 a and that comprises a rotor(not illustrated) rotating around a rotary shaft positioned along theperpendicular direction to the front and rear sides of the substrate 31a. The rotor of the fan 40 is rotated using an electric motor so that,for example, the air that is taken in from the housing 22 a through airinlets (not illustrated) formed on both sides of the axial direction ofthe rotary shaft (i.e., formed on the front side and on the rear side)is discharged through an exhaust outlet (not illustrated) formedopposite to the heat releasing portion 41 b. That is, the flow of airdischarged by the fan 40 reaches the heat releasing portion 41 b and thefins 41 d, as a result of which the heat releasing portion 41 b and thefins 41 d are subjected to cooling. Meanwhile, the fan 40 is fit in anL-shaped notch 31 b formed at a corner of the substrate 31 a. Herein,the heat pipe 41 functions in an identical manner to the heat pipe 7according to the first embodiment.

As illustrated in FIG. 12, in the present embodiment too, the heatreceiving portion 41 a is positioned on the lower side of the heatreleasing portion 41 b in both of the first orientation P1 (FIG. 12A)and the second orientation P2 (FIG. 12B) in an identical manner to thefirst embodiment. In the heat pipe 41 functioning as the heat transportmechanism, in case the heat receiving portion 41 a is positioned on theupper side of the heat releasing portion 41 b thereby forming what iscalled a top heat condition, then the heat transport medium in theliquid state does not easily return to the heat receiving portion 41 afrom the heat releasing portion 41 b. That causes a decline in the heattransport efficiency, that is, in the heat releasing efficiency. Withregard to such a problem, in the present embodiment, the heat receivingportion 41 a is positioned on the lower side of the heat releasingportion 41 b in both of the first orientation P1 and the secondorientation P2 that are defined to be the correct orientations. Hence,it becomes possible to prevent the heat transport efficiency, that is,the heat releasing efficiency from declining, which may happen if theheat receiving portion 41 a is positioned on the upper side of the heatreleasing portion 41 b. Meanwhile, in order to notify the user about thefirst orientation P1 and the second orientation P2, the control modulerefers to the detection result of an orientation sensor (notillustrated) disposed inside the housing 22 a of the second main body 22and accordingly displays pictures corresponding to the first orientationP1 and pictures corresponding to the second orientation P2 on thedisplay screens 25 a and 28 a. Moreover, at least on one of the firstmain body 21 and the second main body 22, an orientation notifyingelement such as a rough portion or a display element can be disposed forthe purpose of notifying the user about the first orientation P1 and thesecond orientation P2.

Moreover, as illustrated in FIGS. 6, 7, and 12; in the presentembodiment too, the heat releasing portion 41 b is disposed at a corner22 g that lies at the upper end of the housing 22 a in both of the firstorientation P1 and the second orientation P2. Since the heat is prone torise inside the housing 22 a due to the air current, disposing the heatreleasing portion 41 b at the corner 22 g that lies at the upper end ofthe housing 3 a in both of the first orientation P1 and the secondorientation P2 makes it possible to prevent heat accumulation fromoccurring inside the housing 22 a.

Furthermore, as illustrated in FIGS. 6, 7, and 8; in the presentembodiment, an exhaust outlet 22 h is formed on a side wall 22 i at thecorner 22 g of the housing 22 a. Thus, the flow of air, which isgenerated by the fan 40 and which gets heated by passing through theheat releasing portion 41 b formed at the corner 22 g, is dischargedmore smoothly from the exhaust outlet 22 h that is formed at the corner22 g of the housing 22 a and that faces the heat releasing portion 41 bfrom up close. As a result, heat accumulation is prevented fromoccurring inside the housing 22 a.

As illustrated in FIG. 12, in the present embodiment, when viewed fromthe front of the display screen 28 a (i.e., when viewed along the lineof sight of FIG. 12), the exothermic CPU 38 is disposed in a rectangulararea Ar1 that lies on the upper side of the center Ct of the second mainbody 22 in the second orientation P2. Hence, the ascending air currentgenerated inside the housing 22 a due to the heat of the exothermic CPU38 or the flow of air drawn in the fan 40 travels a relatively longdistance inside the housing 22 a. As a result, it becomes possible toprevent occurrence of a situation in which the electronic componentsdisposed over a wide area inside the housing 22 a are easily affecteddue to the heat. Moreover, if it is assumed that the exothermic CPU 38lies at the center Ct, then there is a possibility that the heated airaccumulates in the area on the opposite side of the exhaust outlet 22 hwith respect to the center Ct inside the housing 22 a (i.e., on theopposite side of the corner 22 g). With regard to that problem, in thepresent embodiment, in both of the first orientation P1 and the secondorientation P2, the exothermic CPU 38 is disposed in the area on theside of the exhaust outlet 22 h with respect to the center Ct (i.e., onthe side of the corner 22 g). Consequently, the heated air can be easilydischarged to the outside of the housing 22 a. Moreover, in the presentembodiment, at the time of holding the second main body 22 with thehands H, usually the user holds with the hands H the opposite side ofthe rectangular area An positioned on the lower side of the center Ct ineach orientation (see FIGS. 10 and 11). That is, the user happens tohold with the hands H an area that is distantly positioned from the CPU38 or the heat pipe 41. Therefore, the user is spared from holding withthe hands H that area of the housing 22 a which becomes warm due to theheat from the CPU 38 or the heat pipe 41. Thus, while holding thepersonal computer 20 with the hands H, the user is spared fromexperiencing any sense of discomfort that may occur due to the warmingof the housing 22 a.

Moreover, in the present embodiment, as illustrated in FIGS. 7 and 8,air inlets 22 j are formed close to the boundary Bd between the firstmain body 21 and the housing 22 a of the second main body 22. Thus, inthe present embodiment, since the air inlets 22 j are distantlypositioned from the exhaust outlet 22 h, a wider area inside the housing22 a is subjected to cooling by airflow Stf that is let inside thehousing 22 a from the air inlets 22 j and that flows toward the exhaustoutlet 22 h.

Furthermore, as illustrated in FIG. 7, the air inlets 22 j are formed onthe outer side of the substrate 31 a, that is, on the outside of an endedge 31 e of the substrate 31 a in the direction along the surface ofthe substrate 31 a. As a result, the flow of air let in from the airinlets 22 j gets easily distributed on the front side as well as on therear side of the substrate 31 a, so that the electronic componentsinstalled on the front side as well as on the rear side are subjected tocooling without difficulty. Meanwhile, it is also possible to form theair inlets 22 j opposite to the end edge 31 e of the substrate 31 a. InFIG. 7, only the airflow Stf that flows on the front side of thesubstrate 31 a is illustrated.

In the present embodiment too, as illustrated in FIGS. 6, 7, and 13; thepressing member 42 identical to the pressing member 8 in the firstembodiment is fixed to the substrate 31 a. The pressing member 42comprises a pressing portion 42 a, a plurality of arm portions 42 b(three arm portions in the present embodiment), and a second-type armportion 42 d. The pressing portion 42 a is formed into a substantiallyrectangular plate and is mounted above the heat releasing block 38 a,which is mounted on the CPU 38, and mounted above the heat receivingportion 41 a of the heat pipe 41, which is also mounted on the CPU 38.Meanwhile, each constituent element of the pressing member 42 accordingto the present embodiment (i.e., the pressing portion 42 a, the armportions 42 b, a bracket 42 c, the second-type arm portion 42 d, acontact portion 42 e, engaging claws 42 f and 42 g (see FIGS. 7 and 13),and a through hole 42 h (see FIG. 7)) functions in an identical mannerto the corresponding constituent element of the pressing member 8according to the first embodiment (i.e., the pressing portion 8 a, thearm portions 8 b, the bracket 8 c, the second-type arm portion 8 d, thecontact portion 8 e, the engaging claws 8 f and 8 g, and the throughhole 8 h).

However, in the present embodiment, in an identical manner to the armportions 42 b, the second-type arm portion 42 d also exerts a pressingforce against the pressing portion 42 a. That is, the second-type armportion 42 d extends upward while extending outward from the pressingportion 42 a. At the end of the second-type arm portion 42 d is formed adroop portion (a vertical wall portion, not illustrated) that droopstoward the front face 31 c of the substrate 31 a. The lower end of thedroop portion is the contact portion 42 e (see FIG. 7). Meanwhile, inthe present embodiment, on the pressing portion 42 a is formed a throughhole 42 i through which a pin 38 b protruding from the heat releasingblock 38 a is inserted. The engagement of the pin 38 b with the throughhole 42 i makes it possible to prevent misalignment of the heatreleasing block 38 a with respect to the pressing member 42.

As illustrated in FIG. 13, the engaging claws 42 f and 42 g functioningas the engaging portions get engaged in a corner 31 h of the substrate31 a. The engaging claw 42 f gets engaged with an edge 31 f that becomesthe upper side of the substrate 5 a in the first orientation P1. Theengaging claw 42 g has a first wall portion 42 g 1 that gets engagedwith an edge 31 g that becomes the upper side of the substrate 31 a inthe second orientation P2, and has a second wall portion 42 g 2 thatthat gets engaged with a rear face (surface) 31 d of the substrate 31 a.Meanwhile, the corner 31 h of the substrate 31 a is formed by themutually orthogonal edges 31 f and 31 g. In this way, the pressingmember 42 according to the present embodiment has the functionsidentical to the pressing member 8 according to the first embodiment.That enables achieving the same effect as achieved in the firstembodiment.

Although the invention is described with reference to the abovementionedembodiments for a complete and clear disclosure, the appended claims arenot to be thus limited but are to he construed as embodying allmodifications and alternative constructions that may occur to oneskilled in the art that fairly fall within the basic teaching herein setforth. For example, the abovementioned embodiments are explained withreference to a television apparatus or with reference to anotebook-sized personal computer having two display screens. However,alternatively, the invention is also applicable to other electronicdevices having at least a single display screen. For example, theinvention is also applicable to computers (notebook-sized computers ordesktop computers), personal digital assistants (PDAs), smartbooks, orcellular phones having a single display screen.

Moreover, regarding the electronic device, the housing, the exothermiccomponent, the heat transport mechanism, the heat receiving portion, theheat releasing portion, the heat transferring portion, theportion-to-be-fixed, the heat releasing block, the pressing portion, thearm portion, and the engaging portion; the specifications (method,structure, shape, material, size, number, direction, type, arrangement,etc.) can be suitably modified.

Thus, according to an aspect of the invention, it is possible to providea television apparatus and an electronic device in which the pressedstate of components achieved by making use of the pressing member can beprevented from undergoing variation.

1. A television apparatus comprising: a substrate housed in a housingand having an exothermic component mounted thereon; a heat transportmechanism at least partially housed inside the housing, and comprising aheat receiving portion configured to receive heat from the exothermiccomponent, a heat releasing portion configured to release heat, and aheat transferring portion configured to house a medium for carrying heatfrom the heat receiving portion to the heat releasing portion; and apressing member comprising a plurality of portions-to-be-fixed fixed tothe substrate, a pressing portion configured to press the heat receivingportion or press a heat releasing block thermally-linked to the heatreceiving portion against the exothermic body, a plurality of armportions disposed in between the portions-to-be-fixed and the pressingportion, and an engaging portion configured to engage with thesubstrate.
 2. The television apparatus of claim 1, wherein the engagingportion comprises a first engaging portion configured to engage thepressing portion against the substrate with respect to a direction alonga surface of the substrate.
 3. The television apparatus of claim 2,wherein the first engaging portion is configured to restrict thepressing member from rotating along the surface of the substrate.
 4. Thetelevision apparatus of claim 1, wherein the engaging portion comprisesa second engaging portion configured to restrict the pressing memberfrom moving away from a face of the substrate on which the exothermiccomponent is mounted.
 5. The television apparatus of claim 1, furthercomprising a plurality of the engaging portion, each having a differentengaging direction.
 6. The television apparatus of claim 1, wherein theengaging portion is configured to engage at a rim portion of thesubstrate.
 7. The television apparatus of claim 6, wherein the engagingportion is configured to engage at a corner of the substrate.
 8. Thetelevision apparatus of claim 1, wherein the engaging portion isdisposed in at least one of the portions-to-be-fixed.
 9. A televisionapparatus comprising: a substrate housed in a housing and having acomponent mounted or installed thereon; a pressing member fixed on thesubstrate and configured to press the component against the substrate;and an engaging portion formed in the pressing member and configured toengage with an edge of the substrate.
 10. An electronic devicecomprising: a substrate housed in a housing and having an exothermiccomponent mounted thereon; a heat transport mechanism at least partiallyhoused inside the housing, and comprising a heat receiving portionconfigured to receive heat from the exothermic component, a heatreleasing portion configured to release heat, and a heat transferringportion configured to house a medium for carrying heat from the heatreceiving portion to the heat releasing portion; and a pressing membercomprising a plurality of portions-to-be-fixed fixed to the substrate, apressing portion configured to press the heat receiving portion or pressa heat releasing block thermally-linked to the heat receiving portionagainst the exothermic body, a plurality of arm portions disposed inbetween the portions-to-be-fixed and the pressing portion, and anengaging portion configured to engage the pressing member with thesubstrate.